    /* 公共样式表:  所有页面都需要用到的样式 */
    /* 公共属性样式 */
    
    .container {
        /* 版心 */
        width: 1200px;
        margin: 0 auto;
    }
    
    .bd {
        /* 测试工具 */
        border: 1px solid red;
    }
    
    .fl {
        float: left;
    }
    
    .fr {
        float: right;
    }
    
    .clearfix::after {
        content: '';
        height: 0;
        display: block;
        clear: both;
    }
    
    .bg {
        background: rgba(0, 0, 0, 0.2);
    }
    /* 显示 */
    
    .block {
        display: block !important;
    }
    
    .none {
        display: none !important;
    }
    /* 公共模块样式 */
    /* 头部 */
    
    .head {
        width: 100%;
        padding: 18px 20px;
        box-sizing: border-box;
        border-bottom: 1px solid #fff;
        position: absolute;
        /* 这里不能用相对 */
        z-index: 99;
        min-width: 1200px;
    }
    
    .head-btn a:first-child {
        margin-right: 20px;
    }
    
    .head-btn a {
        display: inline-block;
        line-height: 26px;
        padding: 0 15px;
        border: 1px solid #abc8f0;
        border-radius: 13px;
        color: #fff;
        box-sizing: border-box;
    }
    
    .head-regbtn {
        background-color: #ed510a;
        border: none !important;
    }
    
    .head-nav {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        /* css3新属性 平移 */
    }
    
    .head-nav li {
        float: left;
        margin: 0 20px;
    }
    
    .head-nav li a {
        color: #fff;
    }
    
    .head-nav .active {
        font-size: 16px;
        position: relative;
    }
    
    .head-nav .active::after {
        content: '';
        display: block;
        width: 100%;
        height: 3px;
        background-color: #fff;
        position: absolute;
        top: 42px;
    }
    /* 尾部 */
    
    .footer {
        height: 330px;
        padding-top: 16px;
        padding-bottom: 19px;
        box-sizing: border-box;
        background-color: #f8f8f8;
    }
    
    .footer-item {
        width: 160px;
        /* background-color: #ccc;              */
    }
    
    .footer-item .item-title {
        font-size: 14px;
        color: #181818;
        line-height: 68px;
    }
    
    .footer-item .item-desc {
        font-size: 12px;
        line-height: 28px;
    }
    
    .footer-item .item-desc .item-link {
        color: #b3b3b3;
    }
    
    .wechat {
        width: 110px;
        /* border:1px solid red; */
        /* background-color: skyblue; */
        text-align: right
    }
    
    .wechat .title {
        font-size: 16px;
        line-height: 28px;
        padding-top: 21px;
        color: #181818;
    }
    
    .wechat .name {
        font-size: 12px;
        line-height: 27px;
        margin-bottom: 24px;
        color: #c0c0c0;
    }
    /* 最底部 */
    
    .footer-btm {
        font-size: 14px;
        line-height: 20px;
        color: #d1d1d1;
        margin-top: 38px;
    }
    
    .footer-btm a {
        color: #d1d1d1;
    }
    /* 回到顶部 */
    
    .return-top {
        position: fixed;
        left: 50%;
        margin-left: 650px;
        bottom: 60px;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        /* border: 1px solid red; */
        background: url(../../assets/imgs/returntopicon.jpg) no-repeat repeat;
        background-position: -163px -56px;
        /* background-color: rgba(108, 108, 108, 0.3); */
        display: none;
        cursor: pointer;
    }